I've got evidence of water getting into one of the OEM fog lights in my stock bumper. The lens is discolored. OEM repleacements can be had for 30, but I was curious if these units are sealed to the degree that they can't be, or shouldn't be, opened for cleaning and resealing.

I don't mind replacing them, but that's not top of the list, so cleaning them up if possible would be wiser.